Writing on the back of the photograph reads "Canyon with Creek, through which Gen. Howards' wagon train was let down held by ropes tethered to trees in Yellowstone Park."
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Source:
Is found in PC 85, Lucullus Virgil McWhorter Photographs https://libraries.wsu.edu/masc/finders/pc85.htm at Washington State University Libraries' Manuscripts, Archives, and Special Collections (MASC) https://libraries.wsu.edu/masc